In a situation like that, the two things I check first are:
1) DNS lookup failing, especially a reverse lookup..do you have Tomcat
trying to look up a hostname for access logging, perhaps?
2) database connection timing out
Also, I would look at garbage collection, but I doubt that's it.
John
On Fri, 11 Jul 2003 19:22:41 +0000, <tomcat-question@comcast.net> wrote:
> Yes, these occur internally and externally. There does not appear to be
> any network traffic that is causing this (according to the network
> people...). We're also seeing this on two different environments on two
> distinct networks.
>
> After some more digging, there is just NOTHING happening on the machine.
> Dual CPU, with both cpu's sitting at about 99% idle. 1 GB of RAM, and
> it's not even being all used. Tomcat is using about 327MB of RAM with
> maybe 40(?) threads running.
>
> When I submit my request to get the login page (not to process the login,
> just to serve the login page), I couple of the java threads will spin up
> and take maybe 3% of the cpu, but it still takes over 30 seconds to get
> the page.
>
> Still stuggling for ideas.
>
> -- Dave
>> Are these results occurring when tested on a local
>> area network as well?
>>
>> I have had an issue like that, but it turned out to be
>> a networking issue..not tomcat.
>>
>>
>> --- tomcat-question@comcast.net wrote:
>> > With Tomcat 4.1.x
>> > > We've recently run into an issue where some of our
>> > pages either
>> > a) take a really long time to come up (20+ seconds) > or
>> > b) come up, but never really finish loading (the
>> > status bar in IE shows the the > response hasn't finished).
>> > > These are very simple pages (for example, a login
>> > page) and our server load is > minimal (maybe 10 concurrent users).
>> Then,
>> > mysteriously, the problem will go > away by itself. It will also
>> return.
>> > > Given the information above, I'm not expecting any
>> > solutions, but I could use > some help steering me in the right
>> direction with
>> > things to check. We're > hooking up monitoring on the systems (Linux)
>> to
>> > examine memory and CPU > utilization during the slowdowns.
>> > > Any things in particular we should be examining to
>> > try to find the problem? > Any idea why the pages would never fully
>> return from
>> > the server?
>> > > TIA
>> > > -- Dave
>> > >
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